DevExtreme Angular - Item Deletion

To allow the user to delete items from the List, set the allowItemDeleting option to true. The mode in which the user deletes items depends on the value of the itemDeleteMode option. There are several modes that are enumerated in the code below. To spot the difference between them and choose the most suitable one, refer to the example that completes the option's description in the API reference.

$(function() {
    $("#listContainer").dxList({
        // ...
        allowItemDeleting: true,
        itemDeleteMode: "toggle" // or "static" | "slideButton" | "slideItem" | "swipe" | "context"
    });
});

<dx-list ...
    [allowItemDeleting]="true"
    itemDeleteMode="toggle"> <!-- or "static" | "slideButton" | "slideItem" | "swipe" | "context" -->
</dx-list>

import { DxListModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxListModule
    ],
    // ...
})

View Demo

See Also

• List - Data Binding | Deletion in Custom Sources
• List - Localization

You can delete List items programmatically in the following ways.

• By index
  Pass the index to the deleteItem(itemIndex) method. If the List is grouped, this method should be given an object with the indexes of the group and the item to be deleted.

  jQuery

  JavaScript

  var list = $("#listContainer").dxList("instance");
  // Deletes the item with index 1 
  list.deleteItem(1);
  // Deletes the item with index 0 from the group with index 2
  list.deleteItem({ group: 2, item: 0 });

  Angular

  TypeScript

  import { ..., ViewChild } from "@angular/core";
  import { DxListModule, DxListComponent } from "devextreme-angular";
  // ...
  export class AppComponent {
      @ViewChild(DxListComponent) list: DxListComponent;
      deleteItem (index) {
          this.list.instance.deleteItem(index);
      }
      deleteItemFromGroup (itemIndex, groupIndex) {
          // Deletes the item with itemIndex from the group with groupIndex
          this.list.instance.deleteItem({ group: groupIndex, item: itemIndex });
      }
  }
  @NgModule({
      imports: [
          // ...
          DxListModule
      ],
      // ...
  })

• By DOM node
  Pass the DOM node to the deleteItem(itemElement) method.

  jQuery

  JavaScript

  var list = $("#listContainer").dxList("instance");
  // Finds all List items
  var itemNodes = $("#listContainer").find(".dx-list-item");
  // Makes the first item the last
  list.deleteItem(itemNodes[itemNodes.length-1]);

  Angular

  TypeScript

  import { ..., ViewChild } from "@angular/core";
  import { DxListModule, DxListComponent } from "devextreme-angular";
  // ...
  export class AppComponent {
      @ViewChild(DxListComponent) list: DxListComponent;
      deleteLastItem () {
          // Finds all List items
          let itemNodes = document.getElementsByClassName("dx-list-item");
          // Deletes the last item
          this.list.instance.deleteItem(itemNodes[itemNodes.length-1]);
      }
  }
  @NgModule({
      imports: [
          // ...
          DxListModule
      ],
      // ...
  })

See Also

• Widget Basics - Call Methods
• List Demos
• List API Reference

To execute certain commands before or after an item is deleted from the List, handle the itemDeleting or itemDeleted event. If the functions that handle these events are not going to be changed during the lifetime of the widget, assign them to the onEventName option when you configure the widget.

$(function () {
    $("#listContainer").dxList({
        // ...
        onItemDeleting: function(e) {
            var itemData = e.itemData;
            var itemDomNode = e.itemElement;
            var itemIndex = e.itemIndex;
            // Handler of the "itemDeleting" event
        },
        onItemDeleted: function(e) {
            var itemData = e.itemData;
            var itemDomNode = e.itemElement;
            var itemIndex = e.itemIndex;
            // Handler of the "itemDeleted" event
        },
    });
});

<dx-list ...
    (onItemDeleting)="onItemDeleting($event)"
    (onItemDeleted)="onItemDeleted($event)">
</dx-list>

import { DxListModule } from "devextreme-angular";
// ...
export class AppComponent {
    onItemDeleting (e) {
        let itemData = e.itemData;
        let itemDomNode = e.itemElement;
        let itemIndex = e.itemIndex;
        // Handler of the "itemDeleting" event
    }
    onItemDeleted (e) {
        let itemData = e.itemData;
        let itemDomNode = e.itemElement;
        let itemIndex = e.itemIndex;
        // Handler of the "itemDeleted" event
    }
}
@NgModule({
    imports: [
        // ...
        DxListModule
    ],
    // ...
})

If you are going to change the event handlers at runtime, or if you need to attach several handlers to a single event, subscribe to the events using the on(eventName, eventHandler) method. This approach is more typical of jQuery.

var itemDeletingEventHandler1 = function(e) {
    // First handler of the "itemDeleting" event
};

var itemDeletingEventHandler2 = function(e) {
    // Second handler of the "itemDeleting" event
};

$("#listContainer").dxList("instance")
    .on("itemDeleting", itemDeletingEventHandler1)
    .on("itemDeleting", itemDeletingEventHandler2);

See Also

• Widget Basics - Handle Events
• List Demos
• List API Reference